Extractor



Nov. 5, 1940.

H. H. MAcKAL 2,220,376

EXTRACTOR Filed Sept. 2, 1937 uur: n..

NVENTO'R Patented Nov. 5, 1940 para. sr

EXTBACTQR Application September 2;, 1937, Serial No. 162,088.

. 5 Claims.

This invention relates to improvements in'. extractors and its object isto provide a simple tool for pulling spools out of concrete andsplitting them. The spools referred to may be those used with concreteform ties such as shown in Patent No. 2,168,990, issued to Daniel C.Hungerford on August 8, 1939, the application for which. was copendingherewith, which become embedded in the concrete and it is somewhatdifficult to remove them. The present invention relates to a tool forfacilitating their removal. More speciiically, it relates to a threadedtool which may be screwed into and through the spools longi against thefractured end of the tie rod to arrest the inward movement of the tooland to cause the longitudinal movement to be transferred to the spool.The tool is also provided with an arrangement for splitting the spoolafter it has been loosened from the concrete to remove it from the tool.

ll will describe several arrangements which embody my invention and willpoint out its novel features in appended claims.

Referring to the drawing,

Fig. 1 is an elevation of a preferred embodiment of my invention,together with a sectional elevation of a spool, a tie rod, and a portionof a body of concrete with the tool shown in operative position toillustrate the manner of its use.

Fig. 2 is an elevation of a structure of modified form which alsoembodies this invention.

In Fig. l, a wooden spool lil of truncated conical shape and with anaxial bore, and a tie rod ll, are shown embedded in a body l2 ofconcrete. The tool shown in this figure comprises a cylindrical shank2li, the outer end of which is smooth and of a diameter to permit it topass into the bore of the spool. On the remainder of the shfank arespiral threads 2l, preferably with sharp edges which are adapted to bescrewed into the spool. The other end of the shank is of larger diameterand forms a plunger 23. This fits slidably into the cylindrical bore 3|of a body member 39 within which is a spring 32 which presses theplunger out. The body member is slotted on opposite sides, as at 33, toreceive a pin 2li which is driven into the plunger and extends intothese slots. This prevents relative rotation between the body member andthe plunger and limits the outward movement of the plunger.

The end of the body member from which the plunger and shank project, isshaped to form sharp edged wedges 34. Its other end is shaped,

(o1. oi-a) as at 35,1to be insertedinto a turning tool; such as astandard'bit stock,

Before specifically describing. the structure illustrated in the otheriigures of the drawing, I will describe the operation of the tool shownin Fig: 11

The smooth end of the shank 2E! is inserted in the bore of the spool llland the tool rotated to screw the Athreads 2| into the spool. ation-iscontinued until the parts assume therelative position-s lin which theyare shown in full lines. The end of the shank then abuts against thefractured end of the tie rod l l which is solidly embedded in theconcrete. Furth-er rotation of the tool in the same direction will causethe spool to move longitudinally on the shank toward some such positionas that in which it is indicated by broken lines at IGA. It is thenloosened from the concrete and the tool may be removed with the spool onit.

Now when the end of shank 2@ is tapped against some solid body7 such asthe concrete body l2, the plunger 23 will be driven into the body member3@ against the action of spring 32 to cause the wedges 3d to be driveninto the spool to split it. It then falls off from the shank and thetool is ready for a repeated operation.

After the threads 2l are embedded in the spool, the latter can beremoved by applying longitudinal pressure on the body member 3Q tocompress the spring 32 and then suddenly releasing the pressure. Theresult will be an outward impact ofthe body member at the end of slot 33upon the pin 2d which will move the spool outwardly.

The tool shown in Fig. 2 comprises a crank arm 4l) with a handle lllnear one of its ends and a threaded shank 42 near its other end. Thismay be formed, as shown, of an'ordinary wood screw with its head 43Welded to the crank arm. Its other end ld may be blunted, as shown. Atthe sides of the screw head d3 are pointed plungers 45', 45 retracted bysprings 46 with their ends lriveted to an anvil block M.

The spool is extracted from the concrete in the manner previouslydescribed. Then the end Mi of the screw or the end of the spool is heldagainst some solid body, such as the next spool to be removed, and theanvil block 4l tapped to split the spool.

Several structures which embody this invention are illustrated anddescribed to show that it is not limited :to any specic construction andI intend lno limitations other than ithose imposed by the followingclaims.

ThisA oper- What I claim is:

1. An extractor for spools having axial bores, comprising a shank of adiameter to t the bore, external spiral threads thereon, spool splittingmeans at one end of the threads longitudinally movable in relation tothe shank, and means for rotating the shank.

2. An extractor for spools having axial bores, comprising a shank of adiameter to t the bore, external spiral threads thereon, a body memberinto which the shank is slidably tted, and means for preventing relativerotation between the shank and the body member, one end of said memberbeing shaped to form a spool splitting Wedge and its other end shaped tobe engaged by a rotating tool.

3. An ex-tractor for spools having axial bores, comprising a shank of adiameter to t the bore, external spiral threads thereon, the end of theshank beyond the threads forming an abutment member, a body member intowhich the shank is slidably -tted, and means for preventing relativerotation between the shank and the body member and to limit the relativemovement between the shank and said body member, one end of said bodymember being shaped to form a spool splitting Wedge and its other endshaped to be engaged by a rotating tool.

4. An ex-tractor for spools having axial bores, comprising a shank of adiameter to t the bore,

external spiral threads thereon, a body member into which the shank isslidably fitted, means for preventing relative rotation between theshank and the body member and for limiting the relative movement betweenthe shank and said member, and a spring Within the body member pressingagainst the end of the shank, one end of said member being shaped toform a spool splitting wedge and its other end shaped to be engaged by arotating tool.

5. A combined extracting and splitting tool for axially bored spools,said tool comprising a shank of a diameter to t the bore of a spoolembedded in a wall, external helical threads near one of its ends toengage the bore of said spool, a splitting member movable longitudinallyin relation to the shank, said member being constructed with av slothaving parallel sides and closed ends, a transverse pin extending fromthe shank into said slot whereby rotation of the splitting member willbe transmitted to the shank by the engagement of the pin with the sidesof the slot, a spring normally urging the splitting memberlongitudinally away from splitting position to bring the pin against oneend of the slot, said slotpermitting the splitting member to be drivenpercussively into a spool engaged by the threads on the shank.

HENRY H. MACKAL.

